Darcy Friction Factor
Darcy friction factor is proportional to shear stress at pipe/conduit wall as number of velocity heads and is used in momentum transfer in general and turbulent flow calculations in particular. It is equivalent to (4) times Fanning’s friction factor. It is normally defined in one of the following forms
or
or
or
Where: | ||
d | = | Diameter |
delta-P | = | Pressure drop |
dP/dL | = | Pressure drop per unit length |
gc | = | Dimensional constant |
G | = | Mass velocity |
L | = | Length |
rho | = | Density |
V | = | Velocity |